//
//  MainTabBar.swift
//  SinaWeibo
//
//  Created by 郭平 on 15/9/30.
//  Copyright © 2015年 郭平. All rights reserved.
//

import UIKit

class MainTabBar: UITabBar {

    var plusButtonClickBlock: (() -> ())?
    
    override func layoutSubviews() {
        super.layoutSubviews()
        
        var index: CGFloat = 0
        let w = UIScreen.mainScreen().bounds.width / 5
        let h = self.bounds.height
        let frame = CGRect(x: 0, y: 0, width: w, height: h)
        
        for view in subviews{
            
            if view is UIControl && !(view is UIButton){
                
                view.frame = CGRectOffset(frame, index * w, 0)
                
                index += index == 1 ? 2 : 1
            }
        }
        composeButton.frame = CGRectOffset(frame, 2 * w, 0)
    }
    
    // 懒加载 按钮
    lazy var composeButton: UIButton = {
       
        let btn = UIButton(type: UIButtonType.Custom)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        
        btn.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        
        // 按钮点击事件
        btn.addTarget(self, action: "plusButtonClick", forControlEvents: UIControlEvents.TouchUpInside)
        
        self.addSubview(btn)
        
        return btn
    }()
    
    @objc private func plusButtonClick(){
        
        printLog("按钮点击了")
        
        if let block = self.plusButtonClickBlock {
            
            block()
        }
    }

}
